I've been using the earphones off my Sony Digital radio, on my MP3 player.
One of the speakers has been buzzing a bit and I was in the supermarket today and bought a set of cheapo Philips earphones (HE036 Bass Vent) for $10. WoW! What a difference.
The volume on my MP3 player has improved by at least 30-50%. I can hear again!
Makes you wonder how many people could improve their MP3/Radio listening by trying out a few sets of cheapo earphones.
I might move on to the $15 "Super Bass" set next!!